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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) October 8, 2012

41K(n, γ)42K thermal and resonance integral cross section measurements

Felisberto A. Ferreira Jr. , Nora L. Maidana , Vito R. Vanin , Mauro S. Dias , Marina F. Koskinas and Neivy López-Pino
From the journal Radiochimica Acta

Abstract

We measured the 41K thermal neutron absorption and resonance integral cross sections after the irradiation of KNO3 samples near the core of the IEA-R1 IPEN pool-type research reactor. Bare and cadmium-covered targets were irradiated in pairs with Au-Al alloy flux-monitors. The residual activities were measured by gamma-ray spectroscopy with a HPGe detector, with special care to avoid the 42K decay β- emission effects on the spectra. The gamma-ray self-absorption was corrected with the help of MCNP simulations. We applied the Westcott formalism in the average neutron flux determination and calculated the depression coefficients for thermal and epithermal neutrons due to the sample thickness with analytical approximations. We obtained 1.57(4) b and 1.02(4) b, for thermal and resonance integral cross sections, respectively, with correlation coefficient equal to 0.39.


* Correspondence address: Universidade de São Paulo, Laboratório do Acelerador Linear, Rua do Matão, Traversa R 187, Instituto de Física, Cidade Universitária, CEP: 05508 -090 São Paulo, SP, Brasilien,

Published Online: 2012-10-08
Published in Print: 2012-12

© by Oldenbourg Wissenschaftsverlag, München, Germany

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